SLVSGZ5A march   2023  – august 2023 TPS2117

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Functional Modes
      1. 7.3.1 Priority and Manual Mode
        1. 7.3.1.1 Priority Switching
        2. 7.3.1.2 Manual Switching
      2. 7.3.2 Diode Mode
    4. 7.4 Feature Description
      1. 7.4.1 Truth Table
      2. 7.4.2 Soft Start
      3. 7.4.3 Status Indication
      4. 7.4.4 Reverse Current Blocking
    5. 7.5 VINx Collapse Rate
    6. 7.6 Fast Switchover Behavior
    7. 7.7 Output Voltage Drop
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.4 Reverse Current Blocking

The TPS2117 initiates reverse current blocking (RCB) when the VOUT voltage is externally biased and exceeds the input voltage supply being used. Once the output voltage is higher than the input voltage by 42 mV (VRCB,R), the device will shutoff. During this state, the leakage into VOUT and out of VIN is defined by IREV. Once the voltage difference between the output and input lowers to 17 mV (VRCB,F), the channel will turn back on.

GUID-48B8EA17-51A0-4CFA-AEFD-2B34A2F3DCCA-low.jpg Figure 7-3 Reverse Current Blocking Behavior

If RCB is expected to occur, it is recommended to clamp the output or use a high output capacitance (about 100 µF). This will prevent voltage spikes from damaging the device due to output inductance. Reverse current is not a concern during normal switchover from one channel to another. This is because the device implements a break-before-make switching methodology that prevents cross conduction and will not complete switchover until the output voltage is less than the chosen input voltage.